Jig nut



March 8, 1949. 'w. B. HERBERT 2,464,133

JIG NUT` Filed Feb. 1.9, 1947 2 Sheets-Sheet 1` gdm/m March 8, 1949. w. B. HERBERT 2,464,133

I JIG NUT Filed Feb. 19, 1947 2 sheets-sheet 2 37a 51m/MMS Patented Mar. 8, 1949 UNITED -STATES PLAT ENT OF F I CE JIG NUT William B Herhert, Ridgewood, N. J.

4Application February 19, 1'947,Serial No. 729,501

4 Claims.

This invention relates to clamping devices and more particularly to a clamping nut .for ,drilliji'gs or fixtures.

vIt is an object of this invention to zprovide an improved clamping nut of the kind ,to ybe `more specifically described hereinafter, which will .ef- .ifectively clamp the work material on'a jig, .X- yture, machine `or other surface or body, without ithe use of wrenches or other tools withwwhich -undue forces are often `obtained resulting in dis- 'ztortion of the work on the jig, fixture, machine, `:surface or body.

Another object of this invention .is to provide 'a nut of this kind .which may be adjustably se- `cured on a jig in a selected position for successively clamping similar pieces of work on Jthe jig .t.o .have the same operation Aperformed ron the -work as required in mass production technique.

,Still another object of this invention is to `provide an improved clamping nut of this kind hav- Aing a body and a threaded nut loosely connected together so that the .separate parts will not .become readily disassembled when not in use.

A further object of this invention .is to provide ra. clamping nut of this kind having a nut engage- :able on ,a bolt Xed Vto 'the jig, `and a body .en- :gageable about the bolt and loosely .connected to the nut, the body abutting the loweriend ofthe `nut for clamping work material between .the body landthe jig.

yA still further object of this invention is to provide an improved clamping nut having .a `nut engageable with a bolt fixed on thejig, a `body .loose about the bolt and engaging .the lower side of the nut, rotatable .cam locking members ion `the body for applying force between the nutand @the body, and a washer or otherdisposablepiece .between the lower `side of the nut and the upper yside of the cams so that all the Vdeterioration of the assembly due to continued use will beaccumulated at and borne by the washer, which may be disposed of .when worn beyond use and Aanother `Washer readily inserted.

With the above and-other olcijectsV in view, ymy -invention consists of the arrangement, combinaftion and details of construction disclosed inthe y'drawings and specification, and-then--rnorepar- Vticularly pointed out in the appended claims.

In the drawings,

AFigure 1 is a side elevation of a clamping nut constructed according to an embodiment of vthis invention,

Figure'2 is a vertical section taken on the line 42---2 of Figure` 1,

yin Figure 7,

Figure 9 is a top plan view of a second modied rform of this invention,

Figure l0 is a side elevationof the form shown fill Figure 9,

Figure 11 is a transverse `section taken on the line lvl-l lof Figure l0,

Figure l2 is a modified form of nut for use in this assembly.

Referring to the drawings, the numeral 20 designates generally a clamping nut for supporting work to be drilled or otherwise machined, onto a base .2| which may be that of a jig or fixture. The nut 20 is adapted to bexed in place on the .base 2l in such a manner that the work as 22 may be clampedbetween .the nut 20 and the base l2| `by the movement of a cam carried by the .clamping nut 20.

For removing the Work.22 and inserting other work in the jig, ,it is not necessary to remove the .entire nut 2B from the base 2|, but it is .necessary only to rotate the cams suiciently to ,loosen the nut V.'ll on the work, whereby the work may be removed and the other work inserted which will have the same operation performed on it. This `type of nut is used in mass produc- :tion work where many pieces of work are required tohave the same operation as drilling or other .machine work.

'The clamping nut 2B is adapted to be secured onto Aa screw'or bolt 24'vv'hich is fixed at one Yend to the base -21 The nut 20 is'formed with a body S25, having an annular opening 2S drilled or bored 'through the 'center thereof so that the bolt 24 may .be very loosely engaged through the open v,ing A2li. rihe body '25 isformed with parallel flat `,upper and Vlower `surface-s `2"! and 28 respective- 1y so vthat the lower surface 21 may be used for engaging, the upper surface of the work` 2.2 or a suitable .clamp for clamping the Work to the base 2l.

The body ..25 is also .formed with bored openings 'as 29-near the upper edge 28 at right an- 3 gles to the opening 26 and communicating therewith. The openings 29 are disposed on the opposite sides of the opening 2B and open at their upper edge onto the surface 28. Substantially cylindrical cam members 30 are adapted to be rotatably mounted in the openings 29 of the body 25. The cam members 3U are formed with a flat upper surface as 3i which is adapted to register and become aligned with the surface 28 of the body 25 in one position of the cams 33. The cams extend through the openings 29 at both ends thereof, the inner end of the cams extending partially into the opening 26. The outer ends of the cams Sil are connected together by a U- shaped handle 32 which is formed of rigid metal or other material for rotating the opposed cams.

The handle 32 is adapted to be in a substantially horizontal position, as shown in Figure 1, at the time when the surface 3l of the cam is in alignment with the surface 28 of the body. Rotation of the handle 32 in either direction, up or down, will effect rotation of the cams 30 so that the flat surface 3l is disposed entirely on one side of a vertical plane through the center of the openings 29 so that any force downwardly on the cam 3B will not tend to return the flat surface 3l to its original position in alignment with the surface 23.

A nut 34 is provided for threaded engagement with the bolt 2d above the body 25. The nut 34 is provided for securing the body 25 in position on the bolt for operation in securing the work 22. The nut Sli is provided with a nut extension 35 which is adapted to be slidably engaged in the opening 26 of the body 25. The nut extension 35 will stabilize the nut 3&3 and the body 25 as the A clamping nut 20 is put under compression when work is being clamped on the jig or fixture. The nut extension 35 is substantially concentric to the nut 34, extending downward from the lower side thereof :and being cylindrical in shape for slidin and rotation in the opening 25.

The nut Srl and the body 25 are loosely connected together so that they will not become separated or lost when the nut 20 is disassembled, but the nut 313 is at all times slidable and rotatable relative to the body 25.

For loosely connecting these bodies together the nut extension 35 is provided with an annular groove or recess 35 which extends substantially along the length thereof, providing shoulders or ribs 3l at each end of the nut extension. The inner end of the cam members 3i] is adapted to loosely engage in the groove S6 for permitting rotation and sliding of the nut and limiting the sliding movement by engagement with the inner edges of the ribs 3l at each end of the nut eX- tension 35.

In the use land operation of this clamping nut, the nut 2i] is threaded down onto the bolt 24 until the work 22 is snugly clamped onto the base 2l. The nut 54 may be threaded down onto the bolt until this Snug t is obtained and it is not desirable to apply much pressure onto the nut 34 at this time. A washer 33 is carried by the nut extension about the upper rib 37 between the lower surface of the nut 3d, and the upper surface 28 of the body 25. The washert is :adapted to be made of suitable soft metal for absorbing the wear of the clamping nut. When the snug lt is obtained and the work 22 properly positioned on the jig, the handle 32 may be moved upwardly or downwardly to its extreme position where the fiat surface 3i of the cams 3U is disposed entirely on one side of the center line of the nut 20. This movement of the handle :and cams will firmly and securely lock the work 22 to the jig of xture.

As the nut is designed for repeated hard use, the washer 38 is provided as the removable element which may be disposed of when it has become deteriorated after much use. The washer 38 will be formed of a material softer than the cams 3i), whereby the wear will be centered on the washer.

In Figure 7 there is shown a modified form of this invention in which the body a. is formed with the openings 26a and 29a similar to the openings 26 and 29 above described, but the body 25a is substantially longer for greater engagement with the work or clamp :for securing the material to the jig or fixture.

In Figures 9 and 10 there is shown a second modified form of this invention in which the body 25 is provided with a U-shaped frame @il fixed on opposite sides thereof. The side arms il of the frame 45 are adapted to be fixed to the sides of the body 25 by welding i2 or other suitable fastening devices. The two arms il extend freely on one side of the body and the bight iii connects the arms di on the other side of the body. The lower side of the arms 4i will provide the clamp for engaging the work :and the bight Mi will provide a suitable handle for moving the clamp when the clamp is built as a portable object. The side arms 4l are each provided with a U-shaped cutout @5 which registers with the opening 29 through the body 25 to permit the free movement of the cams in the bores 29.

In Figure l2 there is shown a modified form of nut Sila which is adapted for use on a more or less permanent fixture where the jig nut will require little adjustment. 'I'he nut 31311 is provided with the nut extension a similar to the eXtension 35 on the nut 34 described above and a set screw 41 engages through one face of the nut Sa. for xedly securing the nut 34a onto a bolt 24.

For disassembling the clamping nut 20, the cams 30 may be moved endwise of the opening 29 to permit the nutextension 35a to be slid from the bore 26. The handle 32, while being rigid to assure simultaneous rotation of the opposed cams 30, may be sufficiently resilient along its length to permit this small movement of the cams 35.

I do not mean to confine myself to the exact details of construction herein disclosed, but claim all variations falling within the purview of the appended claims.

What I claim is:

l. A clamping nut comprising a body having parallel upper and lower surfaces, said body formed with a vertical bore therethrough, oppositely disposed substantially cylindrical cam members rotatable in said body, said cam members formed with a flat surface on one side, said flat surface being coplanar with said upper surface in one position of Ysaid members, a nut, a tubular nut extension member on the lewer side of said nut, said extension member formed with an annular groove intermediate the length thereof, said tubular extension engageable vin said vertical bore, and one end of said cam members loosely engageing in said groove for restraining said nut against undue sliding movement relative to said body.

2. A clamping nut as set forth in claim l, including a washer between said nut and said cam members.

3. A clamping nut as set forth in claim 1, in-

cluding a U-shaped frame xed on said body longitudinally thereof.

slidabiy engaging in said bore, said extension j formed with an annular groove intermediate the length thereof, the ends of said cam members engaging in said groove for limiting the sliding of said nut on said body.

WILLIAM B. HERBERT.

REFERENCES CITED The oiiowing references are of record in the ile of this patent:

STATES PATENTS Number Name Date 1,373,645 Bandoiy Apr. 5, 11921 1,533,688 Bergh Apr. 14, 1925 2,430,677 Hobart Nov. 11, 1947 FOREIGN PATENTS Number Country Date 21,838 Great Britain 1896 

